package com.huangzhao.gulimall.order.config;

import feign.RequestInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * feignClient的后置拦截功能
 *
 * @author huangzhao
 */
@Configuration
public class GuliFeignConfig {

    @Bean("requestInterceptor")
    public RequestInterceptor getRequestInterceptor() {

        final RequestInterceptor requestInterceptor = requestTemplate -> {
            //1、使用RequestContextHolder拿到刚进来的请求数据
            ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            if (requestAttributes != null) {
                // 旧请求
                HttpServletRequest oldRequest = requestAttributes.getRequest();
                if (oldRequest != null) {
                    //2、同步请求头的数据（主要是cookie）
                    //把老请求的cookie值放到新请求上来，进行一个同步
                    String cookie = oldRequest.getHeader("Cookie");
                    requestTemplate.header("Cookie", cookie);
                }
            }
        };
        return requestInterceptor;
    }
}
